Optimum steeping time for germination is 7-13hr for buckwheat. Hull-on, I believe...
With hulled buckwheat, optimized mash is 15min @ 35C, 15min @ 45C, 40min @ 65C, 30min @ 72C and 10min @ 78C . Grist/liquor ratio of 1:4
In the real world, I'd do 20min @ 40 and 60min@ 65 w/ a mashout at 72 or something.
Hopefully this helps someone, doesnt discuss tannins from what I read (skimmed)... so that might be a separate battle...
This info is by Wijngaard and Arendt, published in Journal of the Institute of Brewing, 2006 vol 112 No.1
I might have to make an all buckwheat pale and see what happens

...so much to brew, so little time...
